Samson 4708 - 2 Design and Principle of Operation

6 EB 8546 EN
Design and principle of operation
2 Design and principle of oper-
ation
The supply pressure regulator is used to sup-
ply pneumatic measuring and control equip-
ment with a constant air supply. The maxi-
mum 12bar pressure of the compressed air
network in a plant is reduced to an adjust-
able minimum pressure of 0.2 to 1.6bar or
0.5 to 6bar.
At the inlet side, the supply pressure regula-
tor is equipped with a lter cartridge with a
mesh size of 20μm. In addition, the regula-
tor can also be equipped with a lter recep-
tacle and a pressure gauge on the outlet side.
12
5
3
1
21
20
Fig.1: Overview of Type4708
The compressed air at the inlet ows across
the lter through the free cross-section be-
tween the seat (1.1) and plug (1.2) and
leaves the output with a reduced pressure
depending on the plug position.
The output pressure to be controlled is trans-
mitted to the diaphragm (2.1) over the con-
necting bore (1.3) and converted into a posi-
tioning force. This force is used to move the
valve plug depending on the force of the po-
sitioning spring (6).
Turning the set point screw (7) causes the
spring force to change and, as a result, the
required set point is adjusted.
The set point ranges of the supply pressure
regulator from 0.2 to 1.6bar and 0.5 to
6bar are determined by various tensions of
the installed positioning spring (6).
Condensed water contained in the com-
pressed air can be collected and drained
when the lter cartridge (11) is mounted hor-
izontally or the lter receptacle (13) is sus-
pended downwards. The screw plug (12)
can be unscrewed or the manual drainage
(16) can be activated to drain condensed
water.